这个词是什么意思？
Still image produced from radiation-sensitive materials (sensitive to light, electron beams, or nuclear radiation), generally by means of the chemical action of light on a sensitive film, paper, glass, or metal. Photographs may be positive or negative, opaque or transparent.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D059036 · MeSH 2026。
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